US2025036104A1PendingUtilityA1
Assessment and control method, system and device for time-energy efficiency of cnc machine tools
Assignee: UNIV SHANDONG SCIENCE & TECHPriority: Aug 20, 2022Filed: Oct 10, 2022Published: Jan 30, 2025
Est. expiryAug 20, 2042(~16.1 yrs left)· nominal 20-yr term from priority
G05B 2219/33099G05B 19/4155G05B 2219/35356G05B 19/406G05B 19/4086
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Claims
Abstract
An assessment and control method, system and device for time-energy efficiency of CNC machine tools. The method comprises: comprehensively analyzing the influence of factors of the startup rate and extra startup frequency of a CNC machine tool on the energy efficiency of the CNC machine tool, and constructing a mathematical model of the time-energy efficiency of the CNC machine tool and the startup rate and extra startup frequency of the CNC machine tool. The time-energy efficiency of the CNC machine tool is monitored to realize the overlimit warning function for the time-energy efficiency of the CNC machine tool to finally control the time-energy efficiency of the CNC machine tool within a target range. The present invention analyzes the influence of the downtime loss of the CNC machine tool on the energy efficiency of the CNC machine tool, and can realize overlimit warning for time-energy efficiency of the CNC machine tool.
Claims
exact text as granted — not AI-modified1 . An assessment and control method for time-energy efficiency of CNC machine tools, comprising:
establishing a startup rate model of a CNC machine tool through the total planned processing time, downtime and non-operation time of the CNC machine tool in a given processing cycle; establishing a time-energy efficiency model of the CNC machine tool by constructing an effective energy model of planned processing, target processing effective energy within operation time, and an extra standby energy model; establishing a relationship model of the startup rate, the extra startup frequency and the time-energy efficiency based on the analysis results of the influence of the startup rate and the extra startup frequency of the CNC machine tool on the energy efficiency of the CNC machine tool; monitoring the time-energy efficiency of the CNC machine tool in real time based on the established relationship model of the startup rate, the extra startup frequency and the time-energy efficiency to conduct overlimit warning for the time-energy efficiency of the CNC machine tool and control the time-energy efficiency of the CNC machine tool within a target range.
2 . The assessment and control method for time-energy efficiency of CNC machine tools according to claim 1 , the assessment and control method for time-energy efficiency of CNC machine tools specifically comprising the following steps:
step 1 , collecting the output power of a main power supply of the CNC machine tool in real time through a power sensor, and processing and analyzing the rule of the state change of a power curve to obtain the total planned processing time T planed , downtime T downtime and extra startup frequency N of the CNC machine tool within a given processing cycle; step 2 , through the downtime T downtime , the extra startup frequency N and single startup time T startup of the CNC machine tool within the given processing cycle, obtaining the non-operation time T unavailable of the CNC machine tool; step 3 , through the total planned processing time T planed and the non-operation time T planed of the CNC machine tool within the given processing cycle, calculating the startup rate η availability of the CNC machine tool; step 4 , through the obtained total planned processing time T planed of the CNC machine tool within the given processing cycle and in combination with the ideal processing time T ideal_CT of a single part and the ideal processing energy E ideal of the single part, calculating the total planned processing effective energy E planed of the CNC machine tool without downtime; step 5 , through the obtained non-operation time T unavailable of the CNC machine tool within the given processing cycle and in combination with the ideal processing time T ideal_CT of a single part and the ideal processing energy E ideal of the single part, calculating the downtime loss effective energy E downtime when the CNC machine tool has downtime; step 6 , through the obtained total planned processing effective energy E planed and downtime loss effective energy E downtime of the CNC machine tool within the given processing cycle, calculating the target processing effective energy E available within the operation time of the CNC machine tool; step 7 , calculating the extra startup energy E startup_ex through the extra startup frequency N of the CNC machine tool within the given processing cycle and energy E startup required for single startup of the CNC machine tool; step 8 , through the target processing effective energy E available , downtime loss effective energy E downtime and extra startup energy E startup_ex within the operation time of the CNC machine tool within the given processing cycle, calculating the time-energy efficiency η availablity_e of the CNC machine tool; step 9 , establishing a relationship model of the time-energy efficiency of the CNC machine tool, the startup rate of the CNC machine tool and the extra startup frequency according to the obtained time-energy efficiency model and the startup rate model of the CNC machine tool; step 10 , comparing the calculated time-energy efficiency η availablity_e of the CNC machine tool within the given processing cycle with a preset time-energy efficiency warning lower limit value η availablity_e L of the CNC machine tool; step 11 , taking corresponding measures by an operator for control according to a warning prompt in step 10 based on the change of downtime factors of the CNC machine tool, so that the time-energy efficiency of the CNC machine tool is within the target range.
3 . The assessment and control method for time-energy efficiency of CNC machine tools according to claim 2 , wherein in step 1 , a power sensor is installed at an air switch of a main power supply of the CNC machine tool to collect the power of the main power supply of the CNC machine tool in real time and conduct A/D conversion; an obtained input power digital signal is transmitted to an information processing terminal and filtered; the operating state of the CNC machine tool is identified online through input power information, and the downtime and extra startup frequency of the CNC machine tool are counted; the CNC machine tool is set to be in a startup state at the beginning of the processing cycle; then the total planned processing time of the CNC machine tool within the processing cycle is denoted as T planed ; the downtime of the CNC machine tool within the processing cycle is denoted as T downtime ; the extra startup frequency of the CNC machine tool within the processing cycle is denoted as N;
in step 2 , a calculation model of the non-operation time T unavailable of the CNC machine tool is as follows:
T
unavailable
=
T
downtime
+
N
×
T
startup
wherein T unavailable represents the non-operation time of the CNC machine tool, T downtime represents the downtime, N represents the extra startup frequency, and T startup represents the single startup time of the CNC machine tool;
for the single startup time T startup of the CNC machine tool, the single startup time T startup of the CNC machine tool is calculated by a mean value method through repeated measurement and recording of the time required for single startup of the CNC machine tool.
4 . The assessment and control method for time-energy efficiency of CNC machine tools according to claim 2 , wherein in step 3 , a calculation model of the startup rate η availablity of the CNC machine tool is as follows:
η
availablity
=
T
planed
-
T
unavailable
T
planed
wherein η availablity represents the startup rate of the CNC machine tool; T planed represents the total planned processing time; and T planed represents the non-operation time of the CNC machine tool within the processing cycle;
in step 4 , a calculation model of the total planned processing effective energy E planed when the CNC machine tool is not shut down is as follows:
E
planed
=
T
planed
T
ideal
_
CT
×
E
ideal
wherein E planed represents the total planned processing effective energy; T planed represents the total planned processing time; T ideal_CT represents the ideal processing time of a single part; E ideal represents the ideal processing energy of a single part;
for the ideal processing time T ideal_CT of a single part and the ideal processing energy E ideal of a single part, through the power sensor installed at the air switch of the CNC machine tool, the time and energy required by the CNC machine tool to process a single part under the condition of ideal processing parameters are obtained through multiple measurement; and the ideal processing time T ideal_CT of a single part and the ideal processing energy E ideal of a single part are obtained by the mean value method.
5 . The assessment and control method for time-energy efficiency of CNC machine tools according to claim 2 , wherein in step 5 , a calculation model of the downtime loss effective energy E downtime when the CNC machine tool has downtime is as follows:
E
downtime
=
T
unavailable
T
ideal
_
CT
×
E
ideal
wherein E downtime represents the downtime loss effective energy; T unavailable represents the non-operation time of the CNC machine tool; T ideal_CT represents the ideal processing time of a single part; and E ideal represents the ideal processing energy of a single part.
6 . The assessment and control method for time-energy efficiency of CNC machine tools according to claim 2 , wherein in step 6 , a calculation model of the target processing effective energy E available of the CNC machine tool within the operation time is as follows:
E
available
=
E
planed
-
E
downtime
wherein E available represents the target processing effective energy within the operation time; E planed represents the total planned processing effective energy; and E downtime represents the downtime loss effective energy.
7 . The assessment and control method for time-energy efficiency of CNC machine tools according to claim 2 , wherein in step 7 , a calculation model of the extra startup energy is as follows:
E
startup
_
ex
=
N
×
E
startup
wherein E startup_ex represents the extra startup energy of the CNC machine tool, N represents extra startup frequency, and E startup represents the energy required by single startup of the CNC machine tool;
in step 8 , a calculation model of the time-energy efficiency η availablity_e of the CNC machine tool is as follows:
η
availablity
_
e
=
E
available
E
available
+
E
downtime
+
E
startup
_
ex
wherein η availablity_e represents the time-energy efficiency of the CNC machine tool; E available represents the target processing effective energy within the operation time; E downtime represents the downtime loss effective energy; and E startup_ex represents the extra startup energy of the CNC machine tool;
in step 9 , an expression of the time-energy efficiency relationship model of the CNC machine tool is as follows:
η
availablity
_
e
=
η
availablity
×
T
planed
×
E
ideal
T
planed
×
E
ideal
+
N
×
E
startup
×
T
ideal
_
CT
wherein η availablity_e represents the time-energy efficiency of the CNC machine tool; η availablity represents the startup rate of the CNC machine tool; T planed represents the total planned processing time of the CNC machine tool; E ideal represents the ideal processing energy of a single part; N represents the extra startup frequency of the CNC machine tool; E startup represents the energy required for single startup of the CNC machine tool; and T ideal-CT represents the ideal processing time of a single part;
in step 10 , if the relational expression η availablity_e ≥η availablity_e L is satisfied, this indicates that the time-energy efficiency of the CNC machine tool is normal; if the relational expression η availablity_e <η availablity_e L is satisfied, a waring is issued to indicate that the time-energy efficiency of the CNC machine tool is abnormal; and meanwhile, the time-energy efficiency of the CNC machine tool within the cycle, the startup rate, the downtime, the extra startup frequency of the CNC machine tool, and other information are displayed on a display screen.
8 . An assessment and control device for time-energy efficiency of CNC machine tools for implementing the assessment and control method for time-energy efficiency of CNC machine tools of claim 1 , the assessment and control device for time-energy efficiency of CNC machine tools comprising: a CNC machine tool ( 1 ), a power sensor ( 2 ), a computer ( 3 ) and a display screen ( 4 ), wherein
the power sensor ( 2 ) is used to measure the power of the CNC machine tool ( 1 ) and obtain the energy data of the CNC machine tool; the computer ( 3 ) is used to process a power signal and store the collected data information of total planned processing time, downtime, extra startup frequency and energy required for single startup of the CNC machine tool; the display screen ( 4 ) is connected with the computer ( 3 ), and is used to display the information of time-energy efficiency, a startup rate, total planned processing time, downtime, extra startup frequency and energy required for single startup of the CNC machine tool.
9 . An assessment and control system for time-energy efficiency of CNC machine tools for implementing the assessment and control method for time-energy efficiency of CNC machine tools of claim 1 , the assessment and control system for time-energy efficiency of CNC machine tools comprising:
a non-operation time acquisition module ( 5 ) of the CNC machine tool, used for acquiring the output power of a main power supply of the CNC machine tool collected in real time through the power sensor, and processing the rule of the state change of a power curve to obtain the total planned processing time and downtime of the CNC machine tool to obtain the non-operation time of the CNC machine tool within a processing cycle; a target processing effective energy acquisition module ( 6 ) within operation time, used for calculating the startup rate of the CNC machine tool through the total planned processing time of the CNC machine tool and the non-operation time of the CNC machine tool, and respectively calculating the total planned processing effective energy without downtime and the downtime loss effective energy with downtime through the total planned processing time, the non-operation time of the CNC machine tool and the ideal processing time of a single part in combination with the ideal processing time of a single part and the ideal processing energy of a single part, to obtain the target processing effective energy within operation time; a relationship model acquisition module ( 7 ), used for calculating the time-energy efficiency of the CNC machine tool through the target processing effective energy within operation time, the downtime loss effective energy and the extra startup energy, establishing a relationship model of the time-energy efficiency of the CNC machine tool, the startup rate of the CNC machine tool and the extra startup frequency based on the established startup rate of the CNC machine tool and the time-energy efficiency, and monitoring the time-energy efficiency of the CNC machine tool in real time through the relationship model of the time-energy efficiency of the CNC machine tool, the startup rate of the CNC machine tool and the extra startup frequency and conducting overlimit warning.
10 . A computer device, comprising a memory and a processor, wherein the memory stores computer programs, and when the computer programs are executed by the processor, the processor executes the assessment and control method for time-energy efficiency of CNC machine tools of claim 1 .Join the waitlist — get patent alerts
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